Zcash’s November upgrade could freeze funds in legacy Sprout pool
The proposed NU7 change would disable version 4 transactions, leaving ZEC in Zcash’s legacy Sprout shielded pool unspendable.
Zcash users holding ZEC in the network’s legacy Sprout shielded pool should move it before the planned NU7 upgrade or risk losing the ability to spend it.
Under Zcash Improvement Proposal-2003, NU7 would stop accepting the older transaction format that allows users to spend Sprout funds. ZEC left in the pool would become unspendable after the upgrade.
The proposal would not burn Sprout funds and leaves open the possibility of restoring access later. However, it warns that holders may never be able to spend funds left in the pool.